Author of books and CDs, Microcontroller, interface programming or new ideas for hobby projects. The Electronics Fundamentals for hobby and education helps the beginner with valuable information.
The electronic logbook is amazing, you can have a look at so many circuits and projects with photos. You will learn many things and make you develop skills.
Elektronik und Mikrocontroller - Burkhard Kainka
For the advanced Hobbyist there are projects on Microcontroller and Measuring and control devices with the USB and PC Interfacing,
SDR Radio with USB
Electronics experiments for children - "For children it is easier than for adults. Since it is enough, if someone applied sufficient time and a little tinkering with them. Often all it takes is a little push to arouse interest and skills."